Brutkey

Trammell Hudson
@th@social.v.st

Thanks for the SWD labels, Ikea!

blurry photo of a small circuit board with CLK, DIO, TX, RX, VCC and GND labeled test pads
Trammell Hudson
@th@social.v.st

Unfortunately it seems that Ikea is now enabling lock bits on their Zigbee devices. I also had to build a custom version of openocd to talk to this efm32s2 MCU https://github.com/knieriem/openocd-efm32-series2

screenshot of openocd saying "debug lock: enabled" along with "you will not bea ble to communicate with this device unless you perform a device erase (if available)"
Trammell Hudson
@th@social.v.st

And after sending a efm32s3_dci_device_erase command, I can debug the chip. So thanks for the $5 dev board with boost converter, Ikea, even if we have to start from zero for the firmware.

openocd session that shows debug lock disabled and a efm32s2 cpu cortex-m33 r0p4 processor.